Maybe your AV, or Windows defender, has deleted a file after you finished the installation.

In the FSX\SimObjects\Airplanes\CS_B727-100\panel folder, make sure you have all of these files there:

Captain_Sim.p721.C02
Captain_Sim.p721.C03
Captain_Sim.p721.C04
Captain_Sim.p721.C05
Captain_Sim.p721.C06
Captain_Sim.p721.C07
Captain_Sim.p721.C08
Captain_Sim.p721.C09
Captain_Sim.p721.C10
Captain_Sim.p721.general
Captain_Sim.p721.GS
Captain_Sim.p721.L01
Captain_Sim.p721.L02
Captain_Sim.p721.L03
Captain_Sim.p721.L04
Captain_Sim.p721.L05
Captain_Sim.p721.L06
Captain_Sim.p721.L07
Captain_Sim.p721.L08
Captain_Sim.p721.L09
Captain_Sim.p721.L10
Captain_Sim.p721.L11
Captain_Sim.p721.L12
Captain_Sim.p721.L13
Captain_Sim.p721.L14
Captain_Sim.p721.L15
Captain_Sim.p721.O00
Captain_Sim.p721.O04
Captain_Sim.p721.O07
Captain_Sim.p721.O08
Captain_Sim.p721.O10
Captain_Sim.p721.O11
Captain_Sim.p721.O12
Captain_Sim.p721.O14
Captain_Sim.p721.O17
Captain_Sim.p721.O18
Captain_Sim.p721.O19
Captain_Sim.p721.O20
Captain_Sim.p721.O21
Captain_Sim.p721.P01
Captain_Sim.p721.P07
Captain_Sim.p721.P09
Captain_Sim.p721.P10
Captain_Sim.p721.P11
Captain_Sim.p721.P12
Captain_Sim.p721.P13
Captain_Sim.p721.P15
Captain_Sim.p721.P601
Captain_Sim.p721.P602
Captain_Sim.p721.P603
Captain_Sim.p721.P604
Captain_Sim.p721.P605
Captain_Sim.p721.R01
Captain_Sim.p721.R02
Captain_Sim.p721.R03
Captain_Sim.p721.R05
Captain_Sim.p721.R06
Captain_Sim.p721.R07
Captain_Sim.p721.R08
Captain_Sim.p721.R09
Captain_Sim.p721.R11
Captain_Sim.p721.R12
Captain_Sim.p721.R15
Captain_Sim.p721.sys.gau <- This is most likely the one that will be missing (removed by your AV/Windows Defender)
Captain_Sim.p721.tools
Captain_Sim.p721.U01
Captain_Sim.p721.U02
Captain_Sim.p721.U03
Captain_Sim.p721.U04
Captain_Sim.p721.U05
Captain_Sim.p721.U06
Captain_Sim.p721.U07
Captain_Sim.p721.U08
Captain_Sim.p721.U09
Captain_Sim.p721.U10
Captain_Sim.p721.U11
Captain_Sim.p721.W01
Captain_Sim.p721.W02
Captain_Sim.p721.W03
Captain_Sim.p721.W04
Captain_Sim.p721.W07
Captain_Sim.p721.W09
Captain_Sim.p721.W10
Captain_Sim.p721.W12
Captain_Sim.p721.wxr.dll <- This might be missing too, but it is only the Weather Radar/Gauge
Captain_Sim.r001.P04
civa

Excluding the two gauges I use bold print for, the rest are .CAB files, witch can be opened and view with a Zip program (WinZip/WinRAR/7Zip), so are not likely to be seen as any kind of threat to Windows. A missing Captain_Sim.p721.sys.gau is highly likely to lead to missing gauges, and is more likey to be seen as a "virus" (it is not a virus, nor is it infected by a virus, IF the installer was downloaded directly from www.captainsim.com) while the Captain_Sim.p721.wxr.dll will only lead to the weather radar being missing. If any gaugers are missing, you need to go to your AV Virus Chest/Vault, to see if they were removed, and if they were, click on them, and select restore so they are put back.

It is still likely that your AV/Windows Defender will continue to remove these "theats" (false positives), so you will need to add it/them to the Exceptions list, which will prevent this from happening, every time you try to use the CS 727.

Note. I have added FSX, FSX-SE, P3Dv3, and P3Dv4, to my AV exclusions list, so that stop it from scanning the files whenever I use one of those flight sims, and a Captain Sim product. I also added the location I have saved all of my Captain Sim addons in to the AV exclusions list, and this prevents it from deleting any "threats" during the installation of them. Windows Defender is always OFF on my PC, but it ON on my laptop, but it doesn't seem to affect my Captain Sim products installed on it.